<html>
<body>
Reports <code>Runnable</code> passed to a <code>Cleaner.register()</code> capturing reference being registered.
If the reference is captured, it will never be phantom reachable and the cleaning action will never be invoked.
<p>Possible sources of this problem:</p>
<ul>
  <li>Lambda using non-static methods, fields, or <code>this</code> itself</li>
  <li>Non-static inner class (anonymous or not) always captures this reference in java up to 18 version</li>
  <li>Instance method reference</li>
  <li>Access to outer class non-static members from non-static inner class</li>
</ul>
<!-- tooltip end -->
<p>Sample of code that will be reported: </p>
<pre><code>
  int fileDescriptor;
  Cleaner.Cleanable cleanable = Cleaner.create().register(this, () -> {
    System.out.println("adsad");
    //<i>this</i> is captured via <i>fileDescriptor</i>
    fileDescriptor = 0;
  });
</code></pre>
<p>This inspection only reports if the language level of the project or module is 9 or higher.</p>
<p><small>New in 2018.1</small></p>
</body>
</html>